Reinforcement for electrical windings



W. S; MOODY.

REINFORCENIENT FOR ELECTRICAL WINDINGS.

APPLICATION FILED FEB. 27, 1915.

Patented Feb. I7, 1920.

lmferwjorz Walter` SMQOOIH,

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I-II5 Attorheg.

VVIJfmessesi UNITED sTATEs li'uiTEnT oEEioE.

WALTER Si -MOODY, OF PITTSFIELD,` MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A. CORPORATION OF NEW YORK.

REINFoRc-EMENT Fon ELECTRICAL WINiJINGs.

To all whom it may concern.'

Be it known that I, IALTER S. MOODY,

'a citizen of the United States, residing at Pittsfield, in the 'county of Berkshire, State cation will be understood.

'1n perspective f (partly in cross-section) a of Massachusetts, have invented certain new and useful Improvements in Reinforcements for ElectricallVindings, of which the f ollowing is a specification.

lVIyinvention relates towindings for electrical apparatus particularly. to those lfor transformers.

As is well known, currents flowing in adjacent conductors develop forces of attraction or repulsion between the conductors depending upon the relative directionsof the currents. .Where the conductors are assembled in coils of a considerable number of turnsper coil, and the currents are of con-4 siderable value` these forces between coils reach high values..l Particularly in large transformers, the forces are generally such as tend to shear the coils, and these are commonly necessarily so large and so arranged I that they are not infrequently disrupted under heavy overloads and short-.circuits -even though supported in the best-manner knownl prior to my invention.

In many large devices, other considerations, such as those of ventilation, require that the windings besupported against these large forces over only portions of the surfaces by 'supporting means engaging the windings at only a plurality of separated I points. 'This obviously makes it especially 'diilicult to suitably support the windings against disruptive forces of great values.

The object of my invention is to provide reinforcing means for such electrical windings. This reinforcement may be preferably either a strip of any suitably strong material as steel, laid in between successive turns, or a-core of lsuch material for the conductor of which the winding is composed.

Preferably also 'the cross-section of the reinforcement is something like arectangle and the reinforcement' is so appliedthat the greater dimensions Aof the cross-sections are approximately parallel to the directions of.

the disrupting forcesl in order to secure the 'greatest strength Vin .the desired direction for a given weight'of material. rThe reinforcement may be applied throughout an entire coilvor winding, or only to such parts of either as..may be necessary in a given CaSe.

Application filed. February 27, 1915. Serial No. 11,074.

In the' accompanying` drawings and the following description I have illustrated and Specificationpf'wasPatent. 'Patented Eeuw, 1920.

described certain embodiments =of my invention through which its general -appl i Figure 1 shows winding. Figs. 4,' and 6, are enlargedl details off-certain embodiments of my invention in cross-section. Fig. 7. diagrammatically' illustrates an embodiment of my invention in but a partof lan'entire coil.

The reinforcing means 12 is preferably applied as a core to the conductor 11 as illustrated in cross-section in Fig. 5, but it may be applied as a separate strip 25' closely interwound with the conductor 26 as shown in cross-section in Fig. 4. The usual insulation 13 is applied to the conductor. .Either form may b e used in either of the tv'o com- .v

monv types of"'windings,`the disk coil or the concentricv coil types. Preferably the conductors `and -reinforcing strips are so laid that the forciesitending to shear the coils are exertedv in the directions ofthe arrows strength of the materials is utilized to the best advantage as will beunderstood. f

InFigl is illustrated a disk coil type of winding with my invention applied as a core for theconductor as inFig. 5'; I now believe my invention will find its greatest` use in this arrangement. Inthis'figure one of the coils 10 is openedto showvthe rein-I forcing means. The greater dimensions of the vrectangular ci'osssections of the conductor and reinforcing strip are in the gen! eral direction of the forces developed by the currents tending to shear the coils. The

coils .are separated inpa'irs by a common.

form of separator I4, the separators being rators .beingcompressed between the pairs lof coils, tend to transmit the stresses developed in any one coil to the outer coil of the winding and whatever coil supports (not. shown) may be used.

In Figs. 2 and 3 isillustrated a winding of the common rectangular concentric coils. 20 and 21 surrounding'acore 23. Such coils are particularly weaknear the centersof Vthe .connected by the usual rods 15. These sepallfi A of each coil if such is suiiicient. -At times it occurs that the shearing stresses in a malong sides. The reinforcing strip 25 is ap.

plied as in Fig. 4, as a separate strip closely intervvound .With the insulated conductor. As will be understood, the mutual forces of these two coils on each other are developed in the general directions ofthe arrows 24, that is, in the general direction `of the greater dimensions ofthe cross-sections of the reinforcement.

F ig. 6 illustrates a modification of the winding of li`ig- 5 wherein each conductor.

and reinforcement is bentv into a- V-shape so as to interlock with the immediately preceding and succeeding turns, thus rendering the coil stronger to the shearing stresses.`

The reinforcement may be applied to the entire portion of each coil., or to only a part jor portion of a coil substantially neutraliZe lor balance each other, While the stresses in another part, as an annular portion at the outer edge ofthe coil, are entirely unneutralized. In sucha case the application of the reinforcing means to but the part of the coil subject tothe uniieutralized stressesv may besatisfactory. li'igu? represents diagrammatically a disk coil with the reinforciiigmeans thus applied. vThis'coil is adapted to be used between tivo other disk coils carrying currents instantaneously in Vthe same directions,V the diameter of one o-f which is substantiallyequal to the length of the line 3 0 and. the diameter of the other being substantially equalto that of the coil illustrated. rlhe `portion ofthis coil of Fig. l which is Within the diameter of theline 30 is subject to stresses which tend' mutually to counteract eachj other; Without this di-- ameter the shearing stresses do not counteract each other. This portion of the coilfis,"

therefore, provided with my improvedreihforcing means. 31 is inter vound with a reinforcing stripSfQ in a manner quite similar to that of( Figs.

l. vlin an electrical apparatus the combina- 'tion with a Winding made up of a plurality ef layers, and means engaging one or more ,stresses on the conductor of said ln this case the conductor@ of said layers at a plurality of separated points for supportingsaid layer or layers against magnetic forces vexerting lateral layers, of a strip of reinforcing material assembled with the conducting material of the turns of said layer or layers and extending inthe directions of those turns. '2. ln an electrical apparatus the combinationwith an electrical coil and means engaging saidcoil at a plurality of separated po-ints for 'supporting said coil against magnetic forces exerting lateral stresses on the conductor of said coil', of reinforcing` -means extending in the direction of, and assembled With the conducting material of the turns of said coil, the dimensions of said reinforcing means in a direction approximately parallel to the directions of the lateral forces on said turns b eing greater than its dimensions in a direction perpendicular thereto.

3. In an electrical apparatus, the combi-Vv nation with an electrical coil and means en-` gagi-ng said coil at a plurality of separated points for supporting said coil against mag- '.iietic' forces exerting lateral stresses on the 7conductor of said coil, of reinforcing means i extending in' the direction of, and assembled I,With the conducting materia-l of the turns ,of

said coil.

4. Electrical apparatus comprising 'a Windv ing and means engagingl saidy Windingat a pluralityl of separated points for supportingv said Winding againstmagnetic forces exerting lateral stresses onI the conductor of said Winding', said Winding comprisingturns of*- a conductor provided With a core of reinforcing material.

5. Electrical apparatus comprising a Winding and means engaging said Winding at a plurality of separatedpoints for supporting said Winding against magnetic forces exerting lateral stresses on the conductor of said Winding, said Winding comprising turns of a conductor of a generally rectangular cross-section provided With a core of reinforcing material of a generally rectangular cross-section, the 'conductor being so arfranged that they longer dimensions of the .rectangular cross-section Iof the conductor and core are approximately parallel to said Alateral stresses onthe conductor.

lln Witness` whereof, ll have hereunto set my hand this l25th. day of February, 1915. WALTER S. MDY.

litnesses: l

f CHARLES R. BLAirELY,

l/Veiirnn C. SMITH.

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